i have a lenovo N21 chrome book(80mg0000us)mfg date 07\24\2015 factory ID cs20. i was on the desktop screen yesterday and i clicked somethimg i dont have a clue what and the mouse button turned into a little square and as i clicked and drug a little picture showed up of what was in side the square in like super clear vision and the little arrow or hand had i believe the word capture under it. im just wondering if you can explain to me how i did this as there are many times this would come in very handi to me. Thanks in advance.